Machine for making pipe-elbows.



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No. 68|,I77'I Patented Aug. 27, I90I.

u. u. ALEXANDER.

MAGHHIE FDR MAKING PIPE ELBUWS.

(Application led Apr. 1, 1901.)

" was: 2 v i nrrorn www @Mmmm TH: cams mns co. momLlTuo..wAsH|-sroN, ma.

. No. Salm. Y .Patented Aug. 27, 190|.

. u. n. ALEXANDER.

MACHINE FOR MAKING PIPE ELBUWS.

` (Application filed Apr. 1, 14901.) ,um model.) 4 shank-sheet s.

ba9 a@ 'wrrussss 4` r lNvEnTon WM mmmnmum IQMAMAMMAWL No. 68u77. Patented Aug. 27. 190|.

u. u. ALEXANDER.

MACHINE. FOB MAKING PIPE ELBOWS.

. Ammann med Apr. 1, 1901.)

(Np Model.)

n: mams PETERS co., mom-Luna., wAsmNGTcN, n. c,

" f scribed and claimed.

UNITED STATES `URBANA D. ALEXANDER, OF CANONSBURG, PENNSYLVANIQA.

MACHINE FORIVIAKING PIPE-ELBOWS.

SPECIFICATION forming* part f Letters Patent No. 681,177, dated August 27, 1901.

I Application filed April l, 1901. Serial No. 53,804. (No model.)

To coll whom t maycocern:

Be itknown that I, URBANA D. ALEXAN- DER, a citizen of the United States, residing at Canonsburg,in the county of `Viashington. and State of Pennsylvania, have invented or discovered certain new and useful Improveject a construction and arrangement of mechanlcal devices whereby a preliminary crimp or bend is formed around the tubular blank and the portions or sides of such bend or crimp on one side of the blank are forced together, thereby bending the blank to the desired shape.

The invention is hereinafter more fully de- In the accompanying drawings, Figure 1 is i a side elevation of my improved crimpingmachine. Fig. 2 is a front elevation of the machine, the movable members of the folding or closing mechanism being removed. Fig. 3 is a sectional elevation of the front portion ofthe machine, the plane of section bei i ing indicated by the line lll Ill, Fig. 2. Fig.

4 is an enlargedview, partly in section, of the folding-head.` Fig. 5 isa sectional View, on an enlarged scale, of the shifting head. Fig. 6 is a transverse section of the folding-head y l. y on a plane indicated by the line VI VI, Fig.

4. Fig. 7 is anend elevation of the shifting head. f Figs. 8 and 9 are detail views illustratingmethods of forming different styles of crimps.` a

In the practice of my invention a supporting anvil or disk 1 is secured to the `end of a shaft 2,.which is so arranged that the anvil or disk will be held in the rear of the clamping and bending jaws, which will be herein- `frame of the machine.

ing-rings 5, separated axsuitable distance and adapted to form internal supports for the blankto be bent. The head is held from rotation on the shaft 2 by means of a spline lor key 6, arranged in a groove on the shaft or formed thereon and adapted to engage a groove in the head, as clearly shown in Fig.

7. A shifting rack 7 is arranged in a groove in the upper side of the shaft 2 and is provided with teeth along its upper edge for engagement with a pawl or finger 8, movably mounted on the head 4. The rack 7 is reciprocated back and forth a suitable distancee., the length of one of the teeth of the rack-by means of a lever 9, pivotally connected to a block 10, which is adj ustably secured to the rack 7, as clearly shown in Figs. 1 and 5. The lever 9 has its lower end pivotally mounted oli a stationary part of the machine and is adapted to be shifted against the tension of a spring 11 by means of a cam projection 12 on the side of the pinion 13.

As will be seen by reference to Figs. 1 and 5, the teeth on the rack '7 and the finger 8 are so constructed that when the rack is given a forward movement by the cam projection 12 a corresponding movement will be imparted to the shifting head 4, and when the rack is returned by the4 action of the spring 11 the teeth will slide under the linger Without imparting any movement to the head. A clamping-plate 14 is mounted upon the head 4and is forced down by a threaded rod 15, so that its operative edge will bear against the side of a blank when the latter is inserted in the shifting head. A sliding plate 16 is movaloly mounted in suitable guides on the front of the machine, and the slide 16 is longitudinally slotted to form guides for the slide 17, both of said slides being in the same vertical plane. Clamping and bending plates 18 and 19, `having concave edges, are secured, respectively, to the slides 16 and 17 so that their concave portions will face each other, as clearly shown in Figs. 2 and 3, so that when the slides are moved toward each other these clamping and bending plates will bear upon and indent the surface of the blank in a plane immediately in front of the supporting anvil or disk 1. The slides 16 and 17 are reciprocated by means of eccentrics 20 and 21, secured upon the shaft 23, which is `mounted in suitable bearings in the frame of the machine. These eccentrics are connected to their rey Spectivefslides byin'eans of straps 24and 25,

which at Vtheir upper .ends surround `,the eccentrics and have their lower ends connected to the slides by means of pins 26 and 27, as clearly shown in Fig. 3. Suitable gearing is interposedv between the shaft 23 and the gearwheel'13, so that the head 4 will be shifted when the clamping and crimping jaws are separated, therebyA permitting the forward movement of the blank over the anvil and between the jaws to present a new surface to be crimped. `The bending slidesand jaws are so adjusted with relation to eachother and to the supporting-anvil that the upper jaw will impart a deeper crimp or bend than the lower jaw, whose principal function is that of .holding the blank in position during the foldingoperation,hereinafter described. The concave edge of the upper jaw 19 is so pro` portioned that the crimp or bend imparted to the blank will be'deepest at the top and gradu` ally diminish around on the sides,where it will merge into the slight bend or crimp formed by the lower jaw. 1

The folding-head consists of an outer ring` 28and an inner vsuppolting-ring 29,secured to a plate 30, which has its outer edge curved to correspond to the curvature desired to be imparted to the blank. .When a vblank has been inserted into the machine,at which time the head 4.is.shifted to the rear thereof, the folding-head is slipped on'to the Vfront endof the blank, its proper Vposition on the `blank being insured by meansof a inger 3l, which projects down into a `notch 32, formed onthe slidelor in a block secured thereto. A yoke 33, which is pivotally connected to a bar or frame 34, is then dropped over the pullingplate 30 of the head, so that itwill bear atthe beginning of the operation against the curved edger of the plate at or near its upperv end. It

is preferred that the yoke 33 shouldbe pivoted lss to a .block 35, adjustably mounted upon the bar or frame 34, so as to permit of an adjustment or change, as may be required by the sizeof thevelbow to be formed. The bar-or frame 34 is pivotally connected at its rear end to an elbow-lever 36, mounted in suitable! bearingson the frame of the machine, and its forward end extends into the path of movement of a lug 37 on a disk 38, secured on a shaft 23, which is rotated through suitable interposed gearing from the power-shaft. The frame or bar 34 is supported at its free end upon friction-rollers 40, so that its line or planeof movement of the frame or bar will be always the same.

'In the operation of the machine after a blank has been placed in position the crimping-jaws are brought together, so as to form a bend or crimp in the pipe, as shown in Figs. 8 and 9. The blank is then fed forward and the jaws 18 and 19 closed to form a second bend. Prior to the first forward feed of the blank lthe yoke 33 is turned down overthe plate 30. Thenv in the ordinary operation of the machine the bar or frame 34 and the yoke 33 are pulled rearwardly, a corresponding movement beingimparted to the pulling-head. In addition to this rearward movement the yoke will slightly tip the pulling-head, so as to close in the sides of the fold or bend made by thefirst operation of the crimping-jaws. -The bar or frame 34 and yoke 33 then move forward, the crimping or bending jaws open, and the shifting head is moved forward Yby the forward movement of the toothed bar 7. The crimping-jaws are again closed onto the blank and the bending or folding head is again pulled tothe rear and also further tipped by the reciprocation of the bar or frame 34. It will be understood that as the bar or frame and its yoke when pulled to the rear, as stated, impart a tip tothe folding-head the yoke will be slightly raised,and when returned to the front, thereby releasing-the yoke from engagement with the plate 30, the yoke will drop down to bear at a new and lower point on the edgeof the plate 30. Hence the tipping of the head and consequent bending of the blank are progressive, step by step, until the operation is completed.

In the construction shown in Fig. 9 the upper bending or grooving jaw `is provided on its front side with a shoulder 41, adapted to bear on the edges of the ridges a, formed `by the jaw, and thereby prevent the rearward movement of such ridge, when the closinghead is tipped. As the inner ridge b is free to be forced back by the movement of the head, it will be forced under the ridge a, thereby producing an overlapping of the folds, as shown in Fig. 9.

The frame 42 is moved back and forth by the pulling-bar 34, which has its ends forked to engage lugs or ears on the sides of the frame 42.

Iclaim herein as my invention- `1. In a machine for making pipe-elbows,

j the combination of a shifting head, means for imparting a step-by-step movement to said head adapted tobe secured to the blank to be operated on, bending and holding jaws, a tip-l ping-head and means for effecting a stepby step angular movement to said head, substantially as set forth.

2. In a machine for making .pipe-elbows, the combination of a supporting shaft, a toothed bar movably mounted'on said shaft, a head movably mounted on the shaft, a pawl movably mounted on the head and adapted to engage the toothed bar, and means for re-A ciprocating the latter, bending and holding jaws,a tipping-head adapted to be secured to the blank to be operated on and means for effecting a step-by-step angular movement to said head, substantially as set forth.

3. In a machine for making pipe-elbows, the combination of a head adapted to receive theend of an elbow-blank, a pulling-plate se cured to the head having its outer edge curved, ayoke adapted to engage the curved edge of the plate at a point outside of the axis of the head, and means for reciprocating the yoke,

.substantially as set forth.

,In amachine` for making pipe-elbows, he combination of a head adapted to receive cured to the headand having its outeredge 5 curved, a reciprocating bar orV frame, a yoke `pivotally connected to the bar or frame, and j adapted to engage the curved edge of the t `plate at a point outside of the axis of thef head, andmeans for reciprocating the bar or :lol` frame, substantially as set forth.

` 5.` In a machine `for making pipe-elbows, the combination of crimping or grooving jaws or plates, one of` said jaws `being provided he end of an elbow-blank, a pulling-plate se# with a holding or retaining shoulder, meansh lfor effecting a step-by-step movement of` the blank between said jaws, a tipping or closing head engaging one end of the blank, and means for effecting a step-by-st-ep angular movement to said head, substantially as set forth.

In testimony whereof I have hereunto set my hand. i

URBANA D. ALEXANDER. Witnesses:

DARWIN S; WoLooTT, F. E. GAITHER. 

